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This commit is contained in:
fc_botelho 2008-03-30 00:23:41 +00:00
parent ca2f228840
commit b671dc57c8
5 changed files with 153 additions and 13 deletions
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4
examples/Makefile.am
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@ -1,4 +1,4 @@
noinst_PROGRAMS = vector_adapter_ex1 file_adapter_ex2
noinst_PROGRAMS = vector_adapter_ex1 file_adapter_ex2 struct_vector_adapter_ex3
INCLUDES = -I../src/
@ -8,3 +8,5 @@ vector_adapter_ex1_SOURCES = vector_adapter_ex1.c
file_adapter_ex2_LDADD = ../src/libcmph.la
file_adapter_ex2_SOURCES = file_adapter_ex2.c
struct_vector_adapter_ex3_LDADD = ../src/libcmph.la
struct_vector_adapter_ex3_SOURCES = struct_vector_adapter_ex3.c

52
examples/struct_vector_adapter_ex3.c Normal file
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@ -0,0 +1,52 @@
#include <cmph.h>
#include <string.h>
// Create minimal perfect hash function from in-memory vector
#pragma pack(1)
typedef struct {
cmph_uint32 id;
char key[11];
cmph_uint32 year;
} rec_t;
#pragma pack(0)
int main(int argc, char **argv)
{
// Creating a filled vector
unsigned int i = 0;
rec_t vector[10] = {{1, "aaaaaaaaaa", 1999}, {2, "bbbbbbbbbb", 2000}, {3, "cccccccccc", 2001},
{4, "dddddddddd", 2002}, {5, "eeeeeeeeee", 2003}, {6, "ffffffffff", 2004},
{7, "gggggggggg", 2005}, {8, "hhhhhhhhhh", 2006}, {9, "iiiiiiiiii", 2007},
{10,"jjjjjjjjjj", 2008}};
unsigned int nkeys = 10;
FILE* mphf_fd = fopen("temp_struct_vector.mph", "w");
// Source of keys
fprintf(stderr, "sizeof(rec_t) -> %ld\n", sizeof(rec_t));
cmph_io_adapter_t *source = cmph_io_struct_vector_adapter(vector, sizeof(rec_t), sizeof(cmph_uint32), 11, nkeys);
//Create minimal perfect hash function using the default (chm) algorithm.
cmph_config_t *config = cmph_config_new(source);
cmph_config_set_algo(config, CMPH_BDZ);
cmph_config_set_mphf_fd(config, mphf_fd);
cmph_t *hash = cmph_new(config);
cmph_config_destroy(config);
cmph_dump(hash, mphf_fd);
cmph_destroy(hash);
fclose(mphf_fd);
//Find key
mphf_fd = fopen("temp_struct_vector.mph", "r");
hash = cmph_load(mphf_fd);
while (i < nkeys) {
const char *key = vector[i].key;
unsigned int id = cmph_search(hash, key, 11);
fprintf(stderr, "key:%s -- hash:%u\n", key, id);
i++;
}
//Destroy hash
cmph_destroy(hash);
cmph_io_vector_adapter_destroy(source);
fclose(mphf_fd);
return 0;
}

83
src/cmph.c
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@ -23,9 +23,35 @@ typedef struct
cmph_uint32 position; // access position when data is a vector
} cmph_vector_t;
/**
* Support a vector of struct as the source of keys.
*
* E.g. The keys could be the fieldB's in a vector of struct rec where
* struct rec is defined as:
* struct rec {
* fieldA;
* fieldB;
* fieldC;
* }
*/
typedef struct
{
void *vector; /* Pointer to the vector of struct */
cmph_uint32 position; /* current position */
cmph_uint32 struct_size; /* The size of the struct */
cmph_uint32 key_offset; /* The byte offset of the key in the struct */
cmph_uint32 key_len; /* The length of the key */
} cmph_struct_vector_t;
static cmph_io_adapter_t *cmph_io_vector_new(void * vector, cmph_uint32 nkeys);
static void cmph_io_vector_destroy(cmph_io_adapter_t * key_source);
static cmph_io_adapter_t *cmph_io_struct_vector_new(void * vector, cmph_uint32 struct_size, cmph_uint32 key_offset, cmph_uint32 key_len, cmph_uint32 nkeys);
static void cmph_io_struct_vector_destroy(cmph_io_adapter_t * key_source);
static int key_nlfile_read(void *data, char **key, cmph_uint32 *keylen)
{
FILE *fd = (FILE *)data;
@ -63,6 +89,17 @@ static int key_byte_vector_read(void *data, char **key, cmph_uint32 *keylen)
}
static int key_struct_vector_read(void *data, char **key, cmph_uint32 *keylen)
{
cmph_struct_vector_t *cmph_struct_vector = (cmph_struct_vector_t *)data;
char *keys_vd = (char *)cmph_struct_vector->vector;
*keylen = cmph_struct_vector->key_len;
*key = (char *)malloc(*keylen);
memcpy(*key, (keys_vd + (cmph_struct_vector->position * cmph_struct_vector->struct_size) + cmph_struct_vector->key_offset), *keylen);
cmph_struct_vector->position = cmph_struct_vector->position + 1;
return *keylen;
}
static int key_vector_read(void *data, char **key, cmph_uint32 *keylen)
{
cmph_vector_t *cmph_vector = (cmph_vector_t *)data;
@ -92,6 +129,12 @@ static void key_nlfile_rewind(void *data)
rewind(fd);
}
static void key_struct_vector_rewind(void *data)
{
cmph_struct_vector_t *cmph_struct_vector = (cmph_struct_vector_t *)data;
cmph_struct_vector->position = 0;
}
static void key_vector_rewind(void *data)
{
cmph_vector_t *cmph_vector = (cmph_vector_t *)data;
@ -148,6 +191,31 @@ void cmph_io_nlnkfile_adapter_destroy(cmph_io_adapter_t * key_source)
free(key_source);
}
static cmph_io_adapter_t *cmph_io_struct_vector_new(void * vector, cmph_uint32 struct_size, cmph_uint32 key_offset, cmph_uint32 key_len, cmph_uint32 nkeys)
{
cmph_io_adapter_t * key_source = (cmph_io_adapter_t *)malloc(sizeof(cmph_io_adapter_t));
cmph_struct_vector_t * cmph_struct_vector = (cmph_struct_vector_t *)malloc(sizeof(cmph_struct_vector_t));
assert(key_source);
assert(cmph_struct_vector);
cmph_struct_vector->vector = vector;
cmph_struct_vector->position = 0;
cmph_struct_vector->struct_size = struct_size;
cmph_struct_vector->key_offset = key_offset;
cmph_struct_vector->key_len = key_len;
key_source->data = (void *)cmph_struct_vector;
key_source->nkeys = nkeys;
return key_source;
}
static void cmph_io_struct_vector_destroy(cmph_io_adapter_t * key_source)
{
cmph_struct_vector_t *cmph_struct_vector = (cmph_struct_vector_t *)key_source->data;
cmph_struct_vector->vector = NULL;
free(cmph_struct_vector);
free(key_source);
}
static cmph_io_adapter_t *cmph_io_vector_new(void * vector, cmph_uint32 nkeys)
{
cmph_io_adapter_t * key_source = (cmph_io_adapter_t *)malloc(sizeof(cmph_io_adapter_t));
@ -181,6 +249,21 @@ void cmph_io_byte_vector_adapter_destroy(cmph_io_adapter_t * key_source)
{
cmph_io_vector_destroy(key_source);
}
cmph_io_adapter_t *cmph_io_struct_vector_adapter(void * vector, cmph_uint32 struct_size, cmph_uint32 key_offset, cmph_uint32 key_len, cmph_uint32 nkeys)
{
cmph_io_adapter_t * key_source = cmph_io_struct_vector_new(vector, struct_size, key_offset, key_len, nkeys);
key_source->read = key_struct_vector_read;
key_source->dispose = key_vector_dispose;
key_source->rewind = key_struct_vector_rewind;
return key_source;
}
void cmph_io_struct_vector_adapter_destroy(cmph_io_adapter_t * key_source)
{
cmph_io_struct_vector_destroy(key_source);
}
cmph_io_adapter_t *cmph_io_vector_adapter(char ** vector, cmph_uint32 nkeys)
{
cmph_io_adapter_t * key_source = cmph_io_vector_new(vector, nkeys);

3
src/cmph.h
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@ -37,6 +37,9 @@ void cmph_io_vector_adapter_destroy(cmph_io_adapter_t * key_source);
cmph_io_adapter_t *cmph_io_byte_vector_adapter(cmph_uint8 ** vector, cmph_uint32 nkeys);
void cmph_io_byte_vector_adapter_destroy(cmph_io_adapter_t * key_source);
cmph_io_adapter_t *cmph_io_struct_vector_adapter(void * vector, cmph_uint32 struct_size, cmph_uint32 key_offset, cmph_uint32 key_len, cmph_uint32 nkeys);
void cmph_io_struct_vector_adapter_destroy(cmph_io_adapter_t * key_source);
/** Hash configuration API **/
cmph_config_t *cmph_config_new(cmph_io_adapter_t *key_source);
void cmph_config_set_hashfuncs(cmph_config_t *mph, CMPH_HASH *hashfuncs);